Phonographic warning signal



April 7, 1942. STONE I 2,278,678

PHONOGRAPHIG WARNING SIGNAL Filed April 10, 1941 INVENTOR RUZHETJZL.$ZO728 ATTORNEY Patented Apr. 7, 1942 si" is.

I er

2,273,678 rnonocnarnic weaning sinner.

Robert L. Stone, Harnden, (3011111., assignor to The Soundscriber Corporation, New lliaven, Conn.

a corporation of Connecticut '10 Claims.

This invention relates tot he art of sound recording upon disc records, and more particularly;

adjacent the limit of its swinging movement toward the center of the record.

One object of this invention is to provide a warning signal device of the above nature which will include a rotating gear member mounted on the feed shaft and located in the path of a resilient arm mounted on the needle-carrying recording arm, which swings across the record.

Another object is to provide a Warning signal device of the above nature wherein the rotatable gear member and the resilient arm are each adjustable to control the time when the audible signal will take place and the loudness thereof.

A further object is to provide a signal device of the above nature which will be simple in construction, inexpensive to manufacture, easy to install and adjust, compact, rugged, precise, or-

, namental in appearance, and very efiicient and durable in use. i

With these and other objects in view, there has been illustrated in the accompanying drawing one form in which the'invention may be conveniently embodied in practice.

In the drawing:

Figure 1 is a broken top plan view-of a disc recording machine, as it appears with the needle in recording position before the warning signal is to be given.

Figure 2 is an enlarged sectional view taken on the line 2--2 of Figure 1, showing the appearance of the cooperating rotating toothed gear and resilient clicking arm, while the warning signal is being produced.

Figure 3 is a top plan view of the resilient signal arm shown by itself.

The present invention is particularly adapted for use in a dictating machine using aluminum disc records of the type disclosed in Patent N0.

2,133,596 issued. October 18, '1938, to Lincoln Thompson, entitled, Feed mechanism for disk recording machines, and relates more especially to a signal which is automatically operated to audibly indicate accurately and positively when the recording needle is approaching the center limit of dictation, so as to warn the operator to finish his dictation quickly, and prepare to reverse the record or substitute a new one for further dictation.

Referring now to the drawings wherein like reference numerals designate like parts throughas out the severalviews, the numeral ill denotes the table of a phonograph recording machine, over which is supported a rotating turntable I i carrying a disc 82, preferably of soft aluminum of the type disclosed in prior Patent No. 2,200,866, issued May 14, 1940, to Lincoln Thompson, entitled, Apparatus for recording sound on thin disks. The turntable is adapted to be rotated at constant speed by a motor driven by a vertical shaft 83. An arm Hi, mounted on a vertical pivoted shaft 15, carries a recording head it which is adapted to be fed at constant speed across the upper surface of the record 12 toward the center of the turntable, whereby a needle 51, preferably diam0nd-tipped, may cut, or emboss, a grooved sound track, therein. The recording arm M is arranged to be swung across the record by a feed mechanismincluding a gear l8 mounted on the motor-driven shaft 53, a gear 19 meshingwith said gear i8 and mounted on a horizontal feed shaft 2% which extends outwardly toward the shaft iii of the recording arm It. The shaft 28 carries a worm 2! at its outer'end which meshes with a worm wheel 22 carried by the shaft I5 to which the recording arm Hi is also connected,

In order to provide a mechanism for producing an audible signal to indicate when the needle 3? has approached closely to the inner edge of the recording surface of the record, which edge is "designated by the dot-and-dash circle 22a of Figure 1, provision is made of a toothed gear 23 which is adjust-ably secured on the shaft 28 as by a set screw 2 which passes through a tapped side hub 25 of the gear 23 and engages against the shaft 20.

Provision is also made of a clicking member,

herein shown as a curved narrow leaf spring 25,

having a flat top and which is adjustably secured to the top of the recording arm M by a pair of screws 2i and 28 which are adapted to pass through a pair of elongated holes 29 and 30 respectively, formed in the leaf spring 26said screws being threaded into the arm it.

The free lower end 3! of the clicker leaf spring 26 is bent downwardly to engage the teeth 32'of the toothed gear 23 whenever the recording arm it reaches a position in which the 'clicker spring 26 will engage the gear 23 as shown in dotted lines in Figure 1 and in full lines in Figure 2, whereby a series of audible periodic clickswill be produced. By means of the provision of the adjusting means for the toothed gear 23 and the leaf spring 26, as above described, these parts may be readily arranged in proper cooperating relationship to produce a warning signal whenall the modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new and for which it is desired to secure Letters Patents, is:

1. In a phonograph recorder, a rotating turntable carrying a disc record, means to rotate said turntable, a stylus-carrying arm mounted on a vertical pivot to swing slowly across said record and record sound vibrations thereon, feed means driven by said'turntable, rotating means to swing said arm, said feed means including a rotating gear, and a depending resilient leaf spring carried by said arm and movable into contact with said gear as the arm swings inwardly to indicate by a clicking sound when the recording is completed.

2. In a phonograph recorder, a rotating turntable carrying a disc record, means to rotate said turntable, a stylus-carrying arm mounted on a vertical pivot to swing slowly across said record and record sound vibrations thereon, feed means driven by said turntable, rotating means to swing said arm, said feed means including a rotating gear, and a depending resilient member carried mounted to swing across said record to record sound vibrations thereon, feed means driven by said turntable, rotating means to swing said stylus slowly across said record, said feed means including a horizontal shaft located under said turntable, a gear carried by said shaft, and a resilient clicker adjustably carried by said arm adapted to engage successive teeth of said gear to indicate when the recording is completed.

6. In a phonograph recorder, a rotating turntable carrying a disc record, means to rotate said turntable, a stylus-carrying arm mounted on a vertical pivot to swing slowly across said record to record sound vibrations thereon, feed means driven by said turntable, rotating means to swing said arm, said feed means including a rotating gear, and a depending curved resilient leaf spring carried by said arm. and movable into contact with said gear as the arm swings inwardly to indicate by a clicking sound when the recording is completed.

7. In a phonograph recording mechanism, a rotating turntable carrying a record, means to drive said turntable, a stylus-carrying arm mounted to swing across said record to record sound vibrations thereon, feed means driven by said turntable, driving means to swing said stylus arm slowly across said record, a resilient clicker member carried by said stylus arm and projecting therefrom, said member having a pair of slots, screw means passing through said slots by said arm and movable into contact with said gear as the arm swings inwardly to indicate by a clicking sound when the recording is completed.

3. In a. phonograph recording mechanism, a rotating turntable carrying a disc record, means to drive said turntable, a stylus-carrying arm mounted to swing across said record to record sound vibrations thereon-feed means driven by said turntable, rotating means to swing said stylus slowly across said record, said feed means including a horizontal shaft located under said turntable, a gear carried by said shaft, and a resilient clicker carried 'by said arm adapted to engage successive teeth of said gear to indicate when the recording is completed.

4. In a phonograph recording mechanism, a mounting plate. a rotating turntable located above said table carrying'adisc record, means to drive said turntable, a stylus-carrying arm mounted to swing across said record .to record sound vibrations thereon, feed means located below said table driven by said turntable, rotating means to swing said stylus slowly across said record, said feed means including a horizontal shaft located under said turntable, a gear carried by said shaft and projecting up through an aperture in said plate. and a resilient clicker carried by said arm adapted to engage successive teeth of said gear to indicate when the recording is completed.

5. In a phonograph recording mechanism, a rotating turntable carrying a disc record, means to drive said turntable, a stylus-carrying arm to permit the position of said member to be adjusted, and means carried by said feed means and located in the path of said clicker member to be engaged thereby and produce a clicking sound at a predetermined point in the recording.

8. In a phonograph recorder, a rotating turntable carrying a disc record, means to rotate said turntable, a stylus- -carrying arm mounted to swing slowly across said record and record sound vibrations thereon, feedmeans driven by said turntable, rotating means to swing said arm, said feed means including a rotating gear, and a depending resilient leaf spring carried by said arm and movable into contact with said gear as the arm swings inwardly to indicate by a clicking sound when the recording is completed.

9. In a phonograph recording mechanism, a rotating turntable carrying a record, means to drive said turntable, a needle-carrying arm mounted to move across said record", means carried by said arm for producing an audible signal, and means connected to said turntable driving means for engaging said means carried by said arm to cause the latter means to operate and produce an audible sound to indicate when said arm has reached a predetermined point on said record.

10. In a phonograph, a rotating turntable carrying a record, means to drive said turntable, a needle-carrying arm mounted to move across said record, a resilientclicker member carried by said arm, and means connected to said tumtable driving means and engageable by said clicker member to produce an audible sound to indicate when said arm has reached a predetermined point on said record.

ROBERT L. STONE. 

